Question

what is force explain briefly​

Answer 1

${\dag\sf{answer}}$

Force

A ‘Force’ is a vector quantity that can be described as a push or pull on an object resulting from the object’s interaction with another object. Whenever there is an interaction between two objects, the objects experience an equal and opposing force on each other. In other words both the objects ‘exert force’ on each other. Force only exists as a result of an interaction. If there is no interaction, the objects no longer experience the force. Force is measured in units called Newtons (N), named after the famous scientist Sir Issac Newton.

Effects of Force

A force acting on an object causes the object to change its shape or size, to start moving, to stop moving, to accelerate or decelerate. When there’s the interaction between two objects they exert a force on each other, these exerted forces are equal in size but opposite in direction. When an object has several forces acting on it, the effects of force is same as one force acting on the object in a certain direction and this overall force is called the ‘resultant force’. The resultant force is essential to change the velocity of an object.

• If the resultant force is zero the forces on the object are balanced.
• If the resultant force acting on the object is ‘zero’ then: the object will remain stationary. In such a case the object will move at a steady speed in a straight line.
• If the resultant force acting on the object isn’t zero then: the object will either accelerate or decelerate.

Answer 2

" $\ \ \ \ \ \huge \mathfrak{ \pmb{ \colorbox{lavender}{ \: \: \: \: \: \: \red F \: \blue O \: \green R \: \purple C \: \orange E \: \ \ \ \ \: }}}$ "

• Force is push or pull acting on a body which tends to change its state of rest or of motion. It is denoted by "F". It has a magnitude and a direction.

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$\large \red{\bold{Formula \ for \ Force \: : - } }$

$\huge\underline{\boxed{\textrm{F = {\texttt{ma}}}}}$

Here,

• " m " = Mass of the body
• " a " = Acceleration
• " F " = Force

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Derivation of Force [ F = ma ] using Newton's law of motion.

$\begin{gathered}\small{\bold{Newton's\:Second\:Law \ states \ that \ :-}}\\ \tiny \: \tt \: The \: rate \: of change \: of \: momentum \: of \: an \: object \\ \tiny \tt depends \: upon \: the \: direction \: and \: magnitude \: of \: applied \: force.\end{gathered}$

• $\blue{\large{\bf{F \propto \cfrac{dp}{dt}}} }$

• $\blue{\large{ \ \bf{F \propto \cfrac{d(mv - mu)}{dt}}} }$
• $\blue{\large{ \ \bf{F = k.m \cfrac{d(v - u)}{dt}}} }$

• $\blue{\large{\ \bf{F = k.ma}} \quad \quad \: \: \: \tt{[If, k = 1]}}$

$\blue{\large{\leadsto \underline{\boxed{\bf{ \pmb{F = ma}}}}}}$

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Unit of Force :-

• SI unit of force is Newton(N).
• C.G.S (centimetre gram second) unit of force is Dyne.

Effects of force -

• Force can change the direction of a moving object.
• Force can change the shape and size of an object.
• Force can change the speed of a moving object.
• Force can change a body′s state of motion or rest.

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